Hide the current server version (closes #1435)

crates/imap/src/op/capability.rs

@@ -64,9 +64,7 @@ impl<T: SessionStream> Session<T> {
                 .with_tag(request.tag)
                 .serialize(
                     concat!(
-                        "* ID (\"name\" \"Stalwart IMAP\" \"version\" \"",
-                        env!("CARGO_PKG_VERSION"),
-                        "\" \"vendor\" \"Stalwart Labs Ltd.\" ",
+                        "* ID (\"name\" \"Stalwart\" \"version\" \"1.0.0\" \"vendor\" \"Stalwart Labs Ltd.\" ",
                         "\"support-url\" \"https://stalw.art\")\r\n"
                     )
                     .as_bytes()

crates/imap/src/op/logout.rs

@@ -14,15 +14,8 @@ impl<T: SessionStream> Session<T> {
     pub async fn handle_logout(&mut self, request: Request<Command>) -> trc::Result<()> {
         let op_start = Instant::now();
 
-        let mut response = StatusResponse::bye(
-            concat!(
-                "Stalwart IMAP4rev2 v",
-                env!("CARGO_PKG_VERSION"),
-                " bids you farewell."
-            )
-            .to_string(),
-        )
-        .into_bytes();
+        let mut response =
+            StatusResponse::bye("Stalwart IMAP4rev2 bids you farewell.".to_string()).into_bytes();
 
         trc::event!(
             Imap(trc::ImapEvent::Logout),